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Capital Stock (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Sep. 22, 2017
Sep. 22, 2017
Sep. 12, 2017
May 10, 2017
Sep. 07, 2016
Jul. 12, 2016
Jul. 08, 2016
Nov. 09, 2015
May 23, 2011
Jan. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock based compensation plans                          
Share-based compensation expense           $ 0.4           $ 2.3 $ 11.5
Restricted stock vested in period                     44,372 83,847  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Units Converted in Period, Weighted Average Grant Date Fair Value                       $ 14.56  
Offering costs     $ 1.3                    
2016 Equity Plan [Member]                          
Stock based compensation plans                          
Shares authorized (in shares)             5,000,000            
2016 Triton Plan [Member]                          
Stock based compensation plans                          
Total unrecognized compensation cost                     $ 7.3    
Vesting period                     1 year 8 months    
TCIL [Member]                          
Stock based compensation plans                          
Share exchange ratio           80.00%              
Common Class A [Member]                          
Stock based compensation plans                          
Stock Issued During Period, Shares, New Issues                     0 140,237 406,970.4
Common Class A [Member] | Option Plan [Member]                          
Stock based compensation plans                          
Options exchanged for common shares (in shares)             517,000 692,126          
Options exchanged for common shares, price (in dollars per share)             $ 13.68 $ 18.14          
Fair value of common stock exchanged for options             $ 7.1 $ 12.6          
Options exercised (in shares)             232,300 297,000          
Common Stock [Member]                          
Stock based compensation plans                          
Stock Issued During Period, Shares, New Issues 802,500   5,350,000                    
Sale of Stock, Price Per Share $ 32.75 $ 32.75 $ 32.75                    
Proceeds from Issuance of Common Stock   $ 192.9                      
Market-based Options [Member] | Common Class A [Member] | Option Plan [Member]                          
Stock based compensation plans                          
Granted during this period (in shares)                 5,370,640        
Service-based Options [Member] | Option Plan [Member]                          
Stock based compensation plans                          
Granted during this period (in shares)                     0 0 0
Service-based Options [Member] | Common Class A [Member] | Option Plan [Member]                          
Stock based compensation plans                          
Granted during this period (in shares)                 2,681,297        
Restricted stock | Non-employee Director Plan [Member]                          
Stock based compensation plans                          
Restricted stock vested in period           26,058              
Restricted stock | Common Class A [Member] | Option Plan [Member]                          
Stock based compensation plans                          
Restricted shares granted (in shares)             113,942            
Restricted stock | Common Class A [Member] | TAL [Member]                          
Stock based compensation plans                          
Restricted shares granted (in shares)                   140,000      
Restricted stock | Common Stock [Member] | 2016 Triton Plan [Member]                          
Stock based compensation plans                          
Number of Shares Tendered by Plan Participants in Connection with Option Exercises                     1,962    
Director [Member]                          
Stock based compensation plans                          
Share-based compensation expense                       $ 0.3 $ 0.5
Director [Member] | Restricted stock | Common Stock [Member] | 2016 Triton Plan [Member]                          
Stock based compensation plans                          
Restricted shares granted (in shares)       38,675 47,075                
Employees, Non-Directors [Member] | Restricted stock | Common Stock [Member] | 2016 Triton Plan [Member]                          
Stock based compensation plans                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Units Converted in Period, Weighted Average Grant Date Fair Value       $ 28.04 $ 14.55